Check-valve.



A. JOHNSON & W. S. DUBLIN. CHECK VALVE.

APPLICATION FILED AUG 27, 1913.

1, 1 1 3,642, Patented Oct. 13, 1914.

ammo/whom Q W/Mm ooeo 41% atfozwuf THE NORRIS PETERS CO.. PHOTO-LITHIL. WASHINGTON, D. L.

' only be rotated upon its seat for grinding purposes or thedislodging of accumulatedscale and other foreign matter, but may; alsobe lifted entirely away from said seat to constructions, and arrangements of parts, all 1 ALFRED JOHNSON AND WALTER s. DUBLIN, or MARION, INDIANA.

CHECK-VALVE.

1 Specificationo fLetters Patent.

Patent d Oct. 13, 1914.

Application filed August 27, 1913. Serial No. 787,021.

To all whom it may concern Be it known that we, ALFRED JOHNSON? and lVAL'rnn S. DUBLIN, citizens of the United States, residing at Marion, in-the county of Grant and State of Indiana, have invented certain new and useful Improve- 'ments in Check-Valves, of which the following is a specification.

The present mventlon relates to improvements 1n check valves and has for its main ob ect the provision of valve lifting means adapted for ositive interlocking connection with the va ve whereby the samemay not release or permit the back pressure normally holding said valve closed toescape and in;

so doing force all obstructing foreign matter from the valve chambers.

To the end of accomplishing the forego-f ing object, we provide the valve with an interlocking key-receiving recess into which a 3 vertically movable key may be engaged for withdrawing the valve from its seat to reciprocate the latter, means being also em-f ployed to assist in the reciprocating action, which latter means normally holds the key retracted in an inoperative position.

With these and other objects in view, our

invention consists of certain combinations,

as hereinafter more fully described, claimed and illustrated in the accompanying drawings, wherein,

Figure 1 is a side elevation of a valve constructed in accordance with our invention,

portions being broken away to show the interior details of the device. Fig. 2 is'an enlarged fragmentary view of thekey terminal of the lifting member; Fig. 3 is a bottom plan view of the key; and Fig. 41' is a top plan view of the valve stem showing more clearly the key-receiving recess.

Throughout the following detail description, and on the several figures of the drawings, similar parts are referred to by like reference characters.

Referring to the drawing and specifically describing our invention, the numeral 1 designates a body or casing of the usual type employed in devices of this nature and having an interior partition 2 in which is formed the valve seat 3, the partition aforesaid dividing the "valve easing into the inlet chamber 1 and the outlet chamber 5.

' Thel numeral 6 designates a valve nor mally disposed upon the seat 3 and having formed upon the same the stem 7 which pro- Upon the casmg 1 issecured inthe usual manner the bonnet 8 having formed interiorly'thereof; a guiding sleeve 9 into the lower portion of which the valve'stem '7 projects, the valve 6 being thus caused to accurately seat upon its seat 3 hereinbefore mentioned. Extending into the bonnet 8 is disposed the valve lifting means consisting of a spindle l terminating at its lower extremity in a key 11 having diametrically opposing lugs 11, as shown most clearly in Fig. 2 of the drawing. The spindle is surrounded at the upper portion'of the bonnet 8 with the usual packingor stuffing box 12, while upon the upper extremity of said bonnet is located the gland nut 13. The spindle at its upper extremity carriesa hand wheel 1 1 for manipul'atingthe key 11, and a spiral spring 15 is disposed between said hand wheel and the gland nut 13 so as to normally hold the valve lifting means in its retracted position shownin Fig. 1 of the drawing. Adjacent the lower terminal. of' the spindle 10 is provided an'annular flange 16 which cooperates with the walls of the sleeve 9 so as to guide vertical movement of the spindle in an obvious manner. The valve stem 7is also pro vided intermediate its length with an annular flange 17 adapted to contact with thelower extremity of the sleeve 9 to limit the upward movement of the valve 6. 1 The latteris also provided therebeneath with a plurality of .guidelegs 18 of the usual type for insuring properseating of the valve in the operation of the invention. i

In the upper extremity of the valve stem 7 is formed a 'transverse 'keyhole slot 19 con necting with the channel or recess 20 formed atright angles to the opening 19. i In explaining the operation or use of our invention, it may be stated that it frequently happens during the use of check valves that the valve adheres to its seat or fails to properly perform its function of checking the pressure, which failure is due to the aocu mulation of scale or similar foreign substances upon the valve seat. Not only is the valve seat itself a point of accumulation but jeots upwardly to approximately the top a portion of the valve casing 1.

. the valve chambers also oftentimes become entirely clogged with sand, dirt and the like, causing stoppage of the operation of the check valve and preventing the supply of feed water to the boiler, in an obvious manner to those skilled in the art to which this invention relates. WVhen the foregoing occurs it is often necessary to entirely remove the valve, disassembling'the parts in order to gain access for the purpose of relieving the valve. With our invention, however, it; is only necessary that the operator depress the spindle 10 against the tension of the spring 15 until the key 11' enters the key-- receiving recess 19 and by a'partial rotation through the instrumentality of thewheel 14 the opposing lugs 11' will engage in the transverse interlocking recess or channel 20. Inthis manner a positive connection between the valve, 6 and the spindle is provided so that the valve may be rotated by the operator to grind the seat in the usual manner for removing the foreign substances from said seat and insure proper positioning of the valve thereupon. We are aware that similar devices have been proposed for the grinding of valves'as just described but we further utilize the positive connection just described to permit the reciprocation of the valve 6 in the valve chamber of the casing so that the back pressure from the boiler will blow from said chamber or chambers the sand and dirt which has accumulated therein. This reciprocation is best accomplished by tapping or jarring the spindle after it has been interlocked with the valve and such jar is necessarily transmitted to the valve-itself. The reaction of the spring 15 against the, jars or. blows imparted to the spindle, it has been found, most effectively opens the valve a suflicient extent to permit 2 the pressure to operate against the accumulations in the, chambers whereby they may? be clearly 'unbe blown therefrom. It will derstood that the spring 15 willcause the valveto be raised to its upper limit of movement as soon as pressure has been relieved from the spindle 10, and during the; connection of the key with the valve stem reciprocation of the valve may be easily .accomplished as desired. In the foregoing manner it will be apparent that the stop page ofgwater supply for a boiler or the inability to properly operate the pump or jector will be effectively overcome without requiring the removal of the valve from its casing, and it willbe equally apparent that the particular type of valve comprehended by our invention may be easily inserted in the ordinary valve casings now in use.

Having thus described the invention, what is claimed as new is:

1. In a reciprocating check valve, the combination of a casing having an internal valve seat, a valve freely movable in said casing, and reciprocatory lifting means normally held retracted in spaced relation, to the valve and terminating in an interlocking member adapted to positively connect with the valve upon depression and rotation of said lifting means whereby to admit of turning of the valve upon its seat and withdrawal of the same therefrom.

2. In a reciprocating check valve, the co1nbination of a casing having a valve seat therein, a valve disposed upon said seat, a valve stem formed on said valve, lifting means for said valve adapted for free reciprocation. in said casing and terminating in a key adapted to positively interlock with the valve stem aforesaid whereby to admit of rotation of the valve upon its seat and reciprocation of the same in the casing, a spring cooperating with the lifting means to hold said key normally spaced from the valve stem, and common guide means for the valve and lifting means aforesaid.

3. In a check valve, the combination of a casing having an internal valve seat, a valve freely movable in said casing, a valve stem extending upwardly from said valve and formed at its upper end with an interlocking key-receiving recess, a bonnet for said casing formed with an internal sleeve, a spring tensioned valve lifting member extending into said bonnet for free reciprocation into the casing and terminating in a key formed with opposing lugs adapted to interlock with the key-receiving recess in said stem to positively connect, the lifting member with the valve, an annular flange on said valve stem adapted to coact with the bonnet sleeve to limit movement of the valve, and an annular flange on the lifting member cooperating with said sleeve to guide said lifting member in reciprocation of the same and inserting the key in the recess of the stem.

In testimony whereof we afiix our signatures in presence of two witnesses.

ALFRED JOHNSON. VVALTEB S. DUBLIN. Witnesses O. M. FLINN, J. S. SrssoN.

Copies of this patent may be obtained tor five cents each, by addressing the Commissioner of Patents.

. 1 Washington, D. G. 

